In a Neurological Study of the Effect of Environment on Mental

Short Answer

In a neurological study of the effect of environment on mental development, rats were randomly assigned to be raised in one of the four following test conditions: Impoverished (wire mesh cage - housed alone), Standard (cage with other rats), Enriched (cage with other rats and toys), and Super Enriched (cage with other rats and toys changed on a periodic basis). After two months, the rats were tested on a variety of learning measures, one of them being the number of attempts needed to learn to navigate a maze. The data for the maze task are below, along with means and standard deviation for each group.
-What is the value of the Mean Group Diff statistic?